-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Somebody in the thread at some point said: | Andy Green wrote: |> I just saw my backup battery is at 0.4V. | | Mine's at 1.52V and I've seen it retain PMU settings, so the phenomenon | does not depend on entering NoPower. | | BTW, the trace isn't very symmetrical on my system. Recovery is about | twice as fast as the plunge into doom. (Also your screenshots show | this.)
I guess it's true, it depends on the load resistance to discharge and the current-limited regulator source impedence to charge, they're not really related. |> It can work out if during startup Vsys is going under Vth(sysmin) which |> is hardcoded at 2.5V, it forces an "emergency shutdown" and pushes us |> into SAVE -- that is what gets us the sticky power loss. Then it goes |> under Vth(syspres) 2V limit and we "reset and enter the NoPower state". | | Also dropping all the way down to 2V seems to be optional. I have | the end of the drop hover around 2.44V at the moment. (After shorting | the backup battery.) Still, emergency shutdown --> Save will get us the right behaviour for the first half either way. It's quite possible SAVE -> STANDBY makes pcf50633 "see" USB power present as "USBINS" and makes it go active again even with a good battery. - -Andy -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org iEYEARECAAYFAkhpHScACgkQOjLpvpq7dMrz6wCfeqeeL/oCCeeSM8irN6wLetcV c4YAoIPgYDalC31pK/meCM1iUC2zOpDi =PrT7 -----END PGP SIGNATURE-----
